Public bug reported:
Binary package hint: klogd
# lsb_release -rd
Description: Ubuntu 8.10
Release: 8.10
# dpkg-query --show | grep sysklogd
sysklogd 1.5-2ubuntu6
Initial Symptom: I was dd'ing from /dev/zero to a file, when klogd's CPU usage
shot to about 100%. I strace'd the process:
...
read(0, "", 4095) = 0
read(0, "", 4095) = 0
read(0, "", 4095) = 0
read(0, "", 4095) = 0
read(0, "", 4095) = 0
...
and it seems to be stuck in an infinite loop. I dug through the source to see
where read is called. There's a non-match in syslogd.c (3rd parameter would be
1024) and a match in klogd.c: function LogProcLine, line 988, which is called
from main, line 1219. LogProcLine checks if read's return code is less than
zero, else passes the buffer to LogLine. LogLine's main loop is while len is
bigger than 0, which obviously is never hit. I surmise that LogProcLine needs
to handle the zero return code (which indicates that the stream has been
closed) or pass this fact back to the main loop which should take appropriate
steps.
** Affects: sysklogd (Ubuntu)
Importance: Undecided
Status: New
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sysklogd enters infinite loop, uses 100% CPU
https://bugs.launchpad.net/bugs/348286
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